#1. "RE: Nikon D3000 and Nikkor AF-S 18-135mm lens" In response to In response to 0
Welcome to Nikonians!! Make sure the lens is fully seated and locked in the mount. If you still have a problem. Clean the electrical contacts on the lens. Make sure that they all project out the same distance. They are spring loaded and can get jammed in. Try remounting the lens. Does it work now? Good Luck and Enjoy your Nikons!